PT-Diagram

Operating temperatures < -30°C and > 220 °C have to be checked and approved by AZ according to the operating conditions. Besides the P/T value of the sleeve the limitations of the valve bodies also have to be considered. Please refer to the EN 12516-1 resp. ASME B16.34 in order to choose a proper pressure rating (PN/class). The shown values refer to austenitic stainless steel 1.4408 (A351 Gr. CF8M). 1) For operating temperatures below -10°C low temperature / austenitic steels are required. 2) Sleeve: There are different sleeve materials / compounds available.

Type CASN

Type CASN-SL

Port Forms

As standard, there are ten plugs forms available per valve size, consisting of five linear and five equal percentage control characteristics. Type “EXTRA” full bore plug valves with equal percentage control characteristics are recommended for very large flow rates (only RH and RH-S types). Furthermore, bespoke plug forms can be calculated and designed according to customer-specific requirements that combine, for example, control properties and free passage.

Characteristics

Type RH, linear control characteristicsType RH, equal percentage control characteristicsModel structure The data was determined by flow simulation and based on the VDI/VDE 2173 with a permissible deviation of +/- 10% (medium = water 20°C, pressure loss Δp = 1 bar). Definition Kvs The KVS value designates the maximum possible throughput for a valve with a 100% opening Definition Kv The flow coefficient Kv [m3/h] is a specific volume flow for the following conditions: – The pressure loss (Δp) via the valve is 105 Pa (1 bar) – The medium is water with a temperature between 278 K and 315 K (5°C to 40°C) Definition Cv The flow coefficient Cv is a valve flow coefficient that does not correspond to S.I. units. It represents the number of U.S. gallons of water which flow through a valve with a pressure loss of 1 psi (0.689 mbar) at a temperature of 40°F to 100°F (4°C to 38°C) within a minute. Cv = Kv/0,865